Dynamics of the physiochemical and community structures of biofilms under the influence of algal organic matter and humic substances
| Autor: | Lei Li, Youngwoo Seo, Sang Hoon Lee, Hodon Ryu, Youchul Jeon, Jorge W. Santo Domingo |
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| Rok vydání: | 2018 |
| Předmět: |
Environmental Engineering
0208 environmental biotechnology 02 engineering and technology 010501 environmental sciences Polysaccharide 01 natural sciences Algal bloom Article Extracellular polymeric substance RNA Ribosomal 16S Organic matter Rhodobacteraceae Waste Management and Disposal Humic Substances 0105 earth and related environmental sciences Water Science and Technology Civil and Structural Engineering chemistry.chemical_classification biology Ecological Modeling Drinking Water Biofilm biochemical phenomena metabolism and nutrition biology.organism_classification Pollution 020801 environmental engineering Sphingomonadaceae Disinfection chemistry Environmental chemistry Biofilms Water treatment |
| Zdroj: | Water Res |
| ISSN: | 1879-2448 |
| Popis: | Increased loading of algal organic matter (AOM) during harmful algal blooms not only burdens water treatment processes but also challenges safe drinking water delivery. While organic constituents promote biofilm growth in drinking water distribution systems (DWDS), the effects of AOM on biofilm formation in DWDS are not well understood. Herein, three parallel biofilm reactors were used to assess and compare how AOM and humic substance (HS)-impacted bulk water, and R2A medium (a control) affect biofilm development for 168 days. The 16S rRNA gene sequencing analyses revealed that the bacterial communities in biofilms were clustered with the organic matter types in bulk water, where Family Comamonadaceae was the most dominant but showed different temporal dynamics depending on the organic matter characteristics in bulk water. Higher diversity was observed in the biofilm grown in AOM-impacted bulk water (BFAOM) than biofilm grown in HS-impacted (BFHS) and R2A-impacted bulk water (BFR2A) as the biofilm matured. In addition, some taxa (e.g., Rhodobacteraceae, and Sphingomonadaceae) were enriched in BFAOM compared to BFHS and BFR2A. The biofilm image analysis results indicated that compared to BFHS, BFAOM and BFR2A had relatively thinner and heterogeneous physical structures with lower amounts of cell biomass, extracellular polymeric substances (EPS), and higher EPS protein/polysaccharide ratios. Overall, this study revealed that how differently AOM and HS-impacted bulk water shape the physiochemical and community structure of biofilm, which can provide insights into assessing biofilm-associated risks and optimizing disinfection practices for biofilm control in DWDS. |
| Databáze: | OpenAIRE |
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